made the masters work on religion and i looked at traditional societies. what lessons did you learn about the role of spirituality in the societies we might be missing? >> religion has different functions in traditional societies. from the function that it functions that it has in modern society. traditional societies use religion a lot more explanation, now science provided the explanations of why there's tides and why the sun seems to go across the sky. so there's a function of religion that has become lost with time. religion still has its function of offering comfort, of helping deal with anxiety. religion used to have a function of teaching us to obey the king or obey the president. the reasons that we obey the president today are not because of religion but because of the rule of law. >> interesting. professor jared diamond, thank you so much for all of that. >> you are welcome. >>> and up next, coughing, sneezing and wheezing. the flu outbreak infecting the nation. >> excuse me. >> how facebook -- well timed there, s.e. facebook helping some fight back. we'll explain it next.